Towel bar



FIG. 1 is a perspective view of a towel bar showing my design;

FIG. 2 is a front elevational view;

FIG. 3 is a rear elevational view;

FIG. 4 is a side elevational view;

FIG. 5 is a side elevational view;

FIG. 6 is a top plan view; and,

FIG. 7 is a bottom plan view.

The broken lines show portions of the towel bar that form no part of the claimed design. 

CLAIM The ornamental design for a towel bar, as shown and described. 